Browsing by Author "Dogru, M."

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238u and 222rn Activity Concentrations and Total Radioactivity Levels in Lake Waters
(Springer, 2013) Zorer, O. Selcuk; Sahan, T.; Ceylan, H.; Dogru, M.; Sahin, S.
The concentrations and distributions of natural radioactivity, uranium and radon in lake waters from around Van, Turkey were investigated with an aim of evaluating the environmental radioactivity. Fourteen lake waters were collected from different six lakes around Van (Turkey) to determine U-238, Rn-222 and total alpha and total beta distributions in 2009. The total alpha and total beta activities were counted by using alpha/beta counter of the multi-detector low background system (PIC-MPC-9604) and the U-238 concentrations were determined by inductively coupled plasma-mass spectrometry (Thermo Scientific Element 2) and radon concentrations were measured with the solid state nuclear track detector technique. The activity concentrations ranging from ND to 0.039 Bq L-1 and from 0.026 to 3.728 Bq L-1 for total alpha and beta, respectively, and uranium concentrations ranging from 0.083 to 3.078 mu g L-1, and radon concentrations varying between 47.80 and 354.86 Bq m(-3) were observed in the lake waters.
Micro-Chemical and Radiological Characterization Using Γ-Spectrometry and Wdxrf Spectrometry and Annual Effective Dose of Cigarette Tobaccos
(Elsevier, 2014) Sogot, O.; Kocaer, A. F.; Zorer, O. Selcuk; Ozdemir, Y.; Dogru, M.
Several kinds of cigarette tobacco were analyzed to determine contents of essential elements, natural and artificial radioactivity. The contents of essential elements and radionuclides were determined by WDXRF and gamma spectrometry, respectively. Samples were analyzed by WDXRF technique for the following elements; Al, P, S. Cl, K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, As, Br, Stand In in cigarette tobaccos. In the contents of essential elements, the mean amounts of I< (48.891%) and Ca (38.358%) have the highest contents in the cigarette tobaccos. The radionuclide activity concentrations of (CS)-C-137, (238)u, Th-232, K-40 and Sr-90 were measured in cigarette tobaccos. According to radioactivity concentration results, U-238 ranged between 0.549 and 6.181 Bq/kg; Th-232 between 0.160 and 3.748 Bq/kg; Cs-137 between 0.023 and 2.355 Bq/kg; Sr-90 between 0.019 and 2.305 Bq/kg and K-40 between 2.894 and 56.333 Bq/kg. It was concluded that the annual effective dose due to inhalation for adults (smokers) for U-238 varied from 4.97 to 55.94 mu Sv/y (average 28.04 mu Sv/y), while for Th-232 from 12.48 to 292.41 mu Sv/y (average 138.65 mu Sv/y) and for K-40 from 18.97 to 370.45 nSv/y (average 139.83 nSv/y). The annual effective dose from Cs-137 and Sr-90 of Chemobyl origin varied from 0.70 to 71.29 nSv/y (average 29.86 nSv/y) and from 9.49 to 1150.93 nSv/y (average 415.29 nSv/y), respectively. (c) 2014 Elsevier B.V. All rights reserved.